· All Inclusive – All in one dual rear hydration system, comes complete with Turbo Wing chassis and two gloss black carbon fiber GORILLA cages with 10 pounds of bottle grip. Everything you need to install 2 more bottles onto the back of your bike.· Highly Adjustable - Designed to fit the widest assortment of saddles of any XLAB dual rear hydration systems. With 3 chassis mounting positions, 5 bottle cage rotational positions, and 10mm of bottle vertical adjustment, removing and inserting the bottle is a breeze.· Compatibility - Fits most cromoly, stainless steel, and titanium round railed saddles. Carbon rail saddle adaptor also available.· Aerodynamic Sweet Spot - Place your bottles in the most aerodynamically advantageous position, directly behind the rider, minimizing drag and maximizing time gains. Either eliminates the need for frame bottles or lets you carry addition water and sports drinks for that long ride.· Includes - 1 High strength 6061-T6 aircraft aluminum alloy mounting chassis with engineered “dimple” cut-outs in the chassis to remove weight while increasing strength and rigidity. 2 X-Straps to attach storage bag at the rear of the carrier. 2 high grip gloss black Gorilla Cages. Corrosion resistant saddle rail and bottle cage mounting hardware combat the elements.